This isn't the kind of thing you want to see on Christmas Eve…

[Warning: Violence]

From that last link:

Speaking on news channel BFM TV, Nunez said a few dozen protestors were responsible for the violence, adding there had been 11 arrests and around 30 minor injuries.

As some demonstrators left the square they threw projectiles at police who responded with tear gas. Skirmishes continued for around two hours before the protestors dispersed.

A gunman carried out the killings at a Kurdish cultural centre and nearby cafe on Friday in a busy part of Paris' 10th district, stunning a community preparing to commemorate the 10th anniversary of the unresolved murder of three activists.

The gunman is reportedly a 69-year-old white man (some reports indicated the man is Turkish, which would be insanely important context) who was released from jail a year ago after attacking a migrant camp with a sword.

From The NYT:

The gunman "clearly wanted to target foreigners," Gérald Darmanin, the French interior minister, told reporters in Paris, though he said his "exact motivations" were unknown. He added that the gunman appeared to have acted alone.

I'll leave you with this Turkish communist flag at the riots that speaks volumes…